Reference Guide

Intermediate System to Intermediate System (IS-IS) | 939
You must enable routing on one or more interfaces to establish adjacencies and establish dynamic
routing.
Only one IS-IS routing process can be configured to perform Level 2 routing. A level-1-2 designation
performs Level 1 and Level 2 routing at the same time.
Related
Commands
set-overload-bit
e
Configure the router to set the overload bit in its non-pseudonode LSPs. This prevents other routers
from using it as an intermediate hop in their shortest path first (SPF) calculations.
Syntax
set-overload-bit
To return to the default values, enter no set-overload-bit.
Defaults
Not set.
Command Mode
ROUTER ISIS (for IPv4)
CONFIGURATION-ROUTER-ISIS-ADDRESS-FAMILY-IPV6 (for IPv6)
Usage
Information
Set the overload bit when a router experiences problems, such as a memory shortage due to an
incomplete link state database which can result in an incomplete or inaccurate routing table. If you set
the overload bit in its LSPs, other routers ignore the unreliable router in their SPF calculations until the
router has recovered.
Command
History
show config
e
Display the changes you made to the IS-IS configuration. Default values are not shown.
Syntax
show config
Command Modes
ROUTER ISIS (for IPv4)
CONFIGURATION-ROUTER-ISIS-ADDRESS-FAMILY-IPV6 (for IPv6)
ip router isis Configure IS-IS routing processes for IP on interfaces and attach an area designator
to the routing process.
net Configure an IS-IS network entity title (NET) for a routing process.
is-type Assign a type for a given area.
Version 8.3.19.0 Introduced on S4820T
Version 8.3.12.0 Introduced on S4810
Version 7.8.1.0 Introduced multi-topology ISIS support
Version 6.3.1.0 Introduced